package com.oncallmng.exception;

import com.oncallmng.common.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.HttpStatus;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.validation.BindException;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseStatus;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import java.util.List;
import java.util.stream.Collectors;

/**
 * 全局异常处理器
 */
@Slf4j
@RestControllerAdvice
public class GlobalExceptionHandler {
    
    /**
     * 处理业务异常
     */
    @ExceptionHandler(BusinessException.class)
    public Result<Void> handleBusinessException(BusinessException e) {
        log.error("业务异常：{}", e.getMessage());
        return Result.error(e.getCode(), e.getMessage());
    }
    
    /**
     * 处理参数校验异常
     */
    @ExceptionHandler(MethodArgumentNotValidException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<Void> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
        List<FieldError> fieldErrors = e.getBindingResult().getFieldErrors();
        String errorMessage = fieldErrors.stream()
                .map(error -> error.getField() + ":" + error.getDefaultMessage())
                .collect(Collectors.joining(", "));
        log.error("参数校验异常：{}", errorMessage);
        return Result.error(400, errorMessage);
    }
    
    /**
     * 处理参数绑定异常
     */
    @ExceptionHandler(BindException.class)
    @ResponseStatus(HttpStatus.BAD_REQUEST)
    public Result<Void> handleBindException(BindException e) {
        List<FieldError> fieldErrors = e.getBindingResult().getFieldErrors();
        String errorMessage = fieldErrors.stream()
                .map(error -> error.getField() + ":" + error.getDefaultMessage())
                .collect(Collectors.joining(", "));
        log.error("参数绑定异常：{}", errorMessage);
        return Result.error(400, errorMessage);
    }
    
    /**
     * 处理权限不足异常
     */
    @ExceptionHandler(AccessDeniedException.class)
    @ResponseStatus(HttpStatus.FORBIDDEN)
    public Result<Void> handleAccessDeniedException(AccessDeniedException e) {
        log.error("权限不足：{}", e.getMessage());
        return Result.error(403, "权限不足");
    }
    
    /**
     * 处理其他异常
     */
    @ExceptionHandler(Exception.class)
    @ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
    public Result<Void> handleException(Exception e) {
        log.error("系统异常", e);
        return Result.error(500, "系统异常，请联系管理员");
    }
} 